On selecting View>preferences i get :
XML Parsing Error: error in processing external entity reference
Location: chrome://browser/content/preferences/preferences.xul
Line Number 11, Column 1:%brandDTD;
^
Or upon selecting to loggin on a site I get :
XML Parsing Error: error in processing external entity reference
Location: chrome://global/content/commonDialog.xul
Line Number 5, Column 66:<!DOCTYPE dialog SYSTEM "chrome://global/locale/commonDialog.dtd">
-----------------------------------------------------------------^